WARNING in __set_task_frozen

Status: upstream: reported on 2026/08/04 22:03
Reported-by: syzbot+2e6000b56cc7ab3b5817@syzkaller.appspotmail.com
First crash: 3d18h, last: 3d14h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __set_task_frozen pm prio:low -1 syz, C 159 3d15h 2d16h 0/29 upstream: reported C repro on 2026/08/06 00:00

Sample crash report:
Bluetooth: hci3: Opcode 0x0c1a failed: -4
Bluetooth: hci3: Opcode 0x0406 failed: -4
Bluetooth: hci3: Suspend notifier action (3) failed: -4
Bluetooth: hci4: Opcode 0x0c1a failed: -4
Bluetooth: hci4: Opcode 0x0406 failed: -4
Bluetooth: hci4: Suspend notifier action (3) failed: -4
Freezing user space processes
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4455 at kernel/freezer.c:129 __set_task_frozen+0x1e9/0x290 kernel/freezer.c:129
Modules linked in:
CPU: 0 PID: 4455 Comm: syz.3.22 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__set_task_frozen+0x1e9/0x290 kernel/freezer.c:129
Code: 68 c7 03 00 80 00 00 bd 00 80 00 00 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a3 83 11 00 0f 0b e9 2c ff ff ff e8 97 83 11 00 <0f> 0b eb bf 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 38 fe ff ff 48 89
RSP: 0018:ffffc90004adfa50 EFLAGS: 00010083
RAX: ffffffff8170aa89 RBX: ffff888027bfbc18 RCX: 0000000000080000
RDX: ffffc9000e773000 RSI: 000000000007a882 RDI: 000000000007a883
RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200095bf2c R12: 0000000000000000
R13: 1ffff11004f7f783 R14: ffff888027bfc6d8 R15: dffffc0000000000
FS:  00007f3ecf9e46c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3a50e5 CR3: 0000000028976000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 task_call_func+0x19e/0x260 kernel/sched/core.c:4308
 __freeze_task kernel/freezer.c:139 [inline]
 freeze_task+0x213/0x3a0 kernel/freezer.c:158
 try_to_freeze_tasks+0x190/0x600 kernel/power/process.c:54
 freeze_processes+0xc5/0x1e0 kernel/power/process.c:137
 suspend_freeze_processes kernel/power/power.h:257 [inline]
 suspend_prepare kernel/power/suspend.c:372 [inline]
 enter_state kernel/power/suspend.c:589 [inline]
 pm_suspend+0x289/0x9a0 kernel/power/suspend.c:626
 state_store+0x202/0x290 kernel/power/main.c:639
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3eceb9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3ecf9e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3ecee25fa0 RCX: 00007f3eceb9e019
RDX: 0000000000000003 RSI: 0000200000000200 RDI: 0000000000000004
RBP: 00007f3ecec3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ecee26038 R14: 00007f3ecee25fa0 R15: 00007ffd7b6decc8
 </TASK>

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/05 01:32 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/05 01:15 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/05 00:40 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/05 00:09 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 23:43 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 23:24 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 22:50 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 22:37 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 22:36 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 22:02 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __set_task_frozen
2026/08/04 22:17 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __set_task_frozen
* Struck through repros no longer work on HEAD.